Malicious PDF — malware analysis report

Static analysis result for SHA-256 0724503eb1cda9b6…

MALICIOUS

PDF

81.8 KB Created: 2021-09-21 03:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bf2876c1ea06fa7849d6af29603c2855 SHA-1: 57e631c30543d8f57e5addbcfb5adaf7d97e7e40 SHA-256: 0724503eb1cda9b6288c4cd20f95ad3fa8cf175d003dbf237dc913dab36f6498
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The heuristics indicate the document is a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://drafthe.ru/uplcv?utm_term=how+to+download+free+fire+apk PDF link annotation
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/as91ogh656v458oem20bic6pp6/tejamesojenoxokix.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/43671453690.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/xaxateduxupakopegedukeb.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/farujivosutewopibapuxu.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/31697540882.pdfIn PDF document text
    • http://sql110.com/pic/bixafosekarebugafosem.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147fd5c1951e---gomexil.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/xizugirofarapagikiju.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/2870287110.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148d243aa08a---37471008504.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/lisomoreroxos.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/darebesuduru.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/ziporuzovajabovikixixufuf.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/migonofuzo.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da07b3fff6---44910444877.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/zotavovugidivanak.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/dubekuvunalepedo.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/9759975087.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/zufuvinusanufexez.pdfIn PDF document text
    • http://ustunongel.com/image/files/bakoropimesanurov.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/dexuvelu.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/90346849988.pdfIn PDF document text
    • https://noventa.cz/media/files/file/fiparajemewina.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/xegomabosabowabazukibe.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83C 10492 bytes
SHA-256: 1d7a5b698e73a14d5ed7f0bd74886b9da7fb3c83001bb97e93fa350b92b1daf7
font_01_sfnt_off0000f02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02A 19028 bytes
SHA-256: b9e9a43af1aa5854a30a6ae3dd90e190f33ef09d5793c5e05435e5f71b2b1edc
font_02_sfnt_off000121b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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